NL1770 is a CGA 8.1 approved hose recommended for hydrocarbons such as liquid or gaseous propane, butane, or a combination of these gases. It can be used for natural gas in its "gaseous" state - it is NOT designed for "liquid" natural gas. It is commonly used on barbecues, trailers, camping equipment, and space heaters. Type 1 propane hose is NOT designed for use on automobiles (must use Type III for automobiles). All coupled assemblies are ULC labeled and are to be installed by a licensed gas fitter only.